Audio System Troubleshooting in Katy & Houston, TX

Find the cause before replacing anything

An audio problem is frustrating because it can look like everything and nothing at once. A buzz could be the amplifier, the cable box, the house wiring or a dimmer switch across the room. Swapping components at random gets expensive fast, and it often leaves the real cause in place. A methodical approach finds the fault, and it usually costs far less than replacement.

EVOTECH IT LLC is a licensed and insured low-voltage contractor with more than 20 years of experience wiring and servicing audio, video and network systems, rated 5.0 on Google. We troubleshoot systems we installed and systems we did not: whole-home audio, TV and surround setups, streaming speakers and commercial background music and paging.

This page is about diagnosis and repair. For new projects, see home audio installation, commercial audio installation or surround sound installation; for platform-specific setup, see Sonos installation.

Symptom-to-cause table

Use this table to narrow things down. The first check column lists things an owner can safely look at; the cause column is where a technician will focus if those checks do not solve it.

Hum and buzz: ground loops and interference

A low, steady hum when nothing is playing is the classic ground loop. It happens when two pieces of equipment connected by a signal cable are grounded through different paths, often an amplifier on one outlet and a cable box whose coaxial line is grounded where the service enters the house. The small voltage difference between those grounds flows through the audio cable’s shield and becomes sound. In the United States, mains hum sits at 60 Hz and its harmonics, which is why it sounds like a deep drone rather than a hiss.

Typical fixes are straightforward once the loop is identified: plugging the connected components into the same outlet or power conditioner, adding a coaxial ground isolator on the cable TV or antenna line, putting an isolation transformer on a long line-level connection, or switching to balanced connections on professional equipment. A sharper buzz that changes when lights are dimmed points to electrical noise from the dimmer coupling into nearby cable, and the fix is separation or a different dimmer.

One fix that is never acceptable is removing or defeating the ground pin on a power cord. It can make the hum go away, and it also removes the safety path that protects people from a fault inside the equipment.

Dropouts and wireless problems

Wireless audio fails differently from wired audio. Streaming speakers, wireless subwoofers, rear surrounds and Bluetooth all depend on radio links that walls, distance and interference can weaken. Dense neighborhoods and apartment buildings in Houston can have dozens of competing Wi-Fi networks, and a speaker at the far end of a two-story house may be at the edge of coverage.

Patterns tell the story. Dropouts at the same time every evening suggest network congestion, dropouts after a router replacement point to configuration, and dropouts in one room point to coverage. Microwave ovens and some older cordless phones interfere with the 2.4 GHz band, which is why a kitchen speaker may stutter while dinner is heating. Mesh systems and a second router behind an internet provider’s gateway are frequent culprits in multi-room audio. A wireless subwoofer that cuts out often has been tucked behind furniture or into a cabinet that blocks its link.

If the dropouts involve Sonos in particular, our Sonos installation page covers that platform’s network requirements in detail; when the root cause is weak coverage, the fix is often better access points from our Wi-Fi installation service.

When one zone or one speaker goes dead

When a single zone goes silent, the cause is usually somewhere between the amplifier and the speakers. The most common physical fault we find is a speaker wire that was punctured by a nail or screw, from hanging a picture, mounting shelves or remodeling, and now shorts the two conductors. Many amplifiers protect themselves by muting a channel that sees a short, so the zone goes quiet and the other zones keep working.

Other frequent causes include a worn volume control in a bathroom or bedroom, corroded connections on outdoor speakers after years of Gulf Coast humidity, water damage to a patio speaker exposed to direct rain, a blown fuse or failed channel in the amplifier, or a zone simply muted or reassigned in the app. Swapping the dead zone onto a known-good amplifier channel is a quick way to tell whether the fault moves with the amplifier or stays with the wiring and speakers.

Commercial 70-volt systems add their own failure modes: a speaker transformer that has failed, speakers added to a line past the amplifier’s power budget, or one bad speaker loading down an entire line. Owners should leave those lines alone, because a 70-volt line carries enough voltage to give a shock while the system is running.

Lip-sync, pops and distortion

Lip-sync problems

When voices land before or after lips move, the TV’s picture processing is usually delaying the picture while the audio races ahead. Game mode or a lower processing setting often closes the gap. Audio that passes through several devices, for example a streaming box into a TV into a soundbar, can drift further, and Bluetooth speakers and headphones add their own delay that no setting fully removes. Most TVs, soundbars and receivers have an audio delay adjustment; we fix the chain first and use that adjustment to fine-tune.

Pops and crackle

A thump when the system powers on usually means the amplifier is waking before the sources, or HDMI-CEC is waking devices in the wrong order. Crackle during play points to a loose or oxidized connection, stray wire strands touching at a terminal, or a speaker driver whose voice coil is rubbing. A pop that grows worse over months can be an aging component inside an amplifier.

Distortion

Distortion at moderate volume is often gain structure: a source turned to maximum feeding an amplifier set low, or the reverse, so one stage clips before the other has done its job. An amplifier driving a load lower than it is rated for distorts and runs hot. A tweeter that has been overdriven sounds harsh or dead on top, and it frequently fails because of clipping rather than too much power.

Checks you can do before calling

1. Write down the pattern. Which rooms, what time, what was playing, and whether anything changed recently, such as a new router, a TV update, a storm or a remodel.
2. Check the obvious settings. Mute, volume, source selection and grouping in the app or on the keypad, and the balance setting on the receiver.
3. Check the TV’s audio output settings if the problem involves TV sound: the correct HDMI port, HDMI-CEC enabled and the output format set to auto or bitstream.
4. Restart in order. Turn off amplifiers first, then processors and sources; power up sources first and amplifiers last.
5. Look at the equipment. Status lights, error indicators, and heat. If a shelf is too hot to leave your hand on, ventilation is part of the problem.
6. Try another source. If the fault is gone with a different app or input, the problem is upstream of the speakers.
7. Check the network, if other devices are also dropping, before blaming the speakers.

Stop there. Do not open amplifier covers, pull speakers out of ceilings, or disconnect wiring inside walls, and leave commercial 70-volt lines to a technician.

What a technician tests

A diagnostic visit works from measurements rather than guesses.

• Line resistance. Measuring each speaker run from the equipment end: a normal passive speaker reads a few ohms, a short reads close to zero, and a break reads open. That single measurement often locates a punctured wire before anyone climbs into the attic.
• Swap tests. Moving a zone to a known-good amplifier channel, or a speaker to a known-good line, to see whether the fault follows the component.
• Test signals. Test tones and tone tracers confirm which cable goes where when labels are missing.
• Ground loop isolation. Disconnecting and isolating connections one at a time until the hum disappears.
• Amplifier checks, including output on each channel, protection status, gain settings and operating temperature.
• Network analysis. Signal strength where the speakers sit, channel congestion, address assignments, and settings such as client isolation that block discovery.
• HDMI and CEC. Port selection, cable capability for ARC or eARC, and how each device negotiates audio formats.
• 70-volt lines. An impedance meter on each line compared against the tap budget.

Repair or replace? How we decide

Our aim is to fix what can be fixed and be honest when replacement is the better value.

We explain what we found, show you the measurements when they are relevant, and let you decide. When a repair makes sense, we can often complete it during the same visit if the parts are on hand.

How an EVOTECH diagnostic visit works

1. Phone questions first. A few minutes describing the symptom often tells us what to bring.
2. Reproduce the problem. We see or hear the fault ourselves before changing anything.
3. Test from the equipment outward, using the measurements above rather than swapping parts on speculation.
4. Explain the findings in plain language, with repair and replacement options where both apply.
5. Repair, on the same visit when practical, then confirm the fix under the conditions that caused the fault.
6. Record what we found, including labels and notes that make the next service call faster.

Homes versus businesses

In homes, the usual suspects are wireless issues, TV connections, punctured wires after remodeling and amplifiers overheating in cabinets. In businesses, we see overloaded 70-volt lines, paging that no longer ducks the music, kitchen grease clogging amplifier vents and systems with no documentation. We schedule business visits around opening hours when possible. Around the Houston area, storms bring power surges and outages that damage equipment, and summer heat in garages and closets shortens the life of amplifiers not kept in conditioned space.

What affects the cost of audio troubleshooting

• Whether the fault is constant or intermittent. A fault that shows up on demand is faster to find than one that appears twice a week.
• Access to attics, ceilings and equipment, particularly in two-story homes and high commercial ceilings.
• System size, meaning the number of zones, speakers and components in the signal path.
• Documentation. Labeled cables and a zone map make diagnosis quicker; unlabeled systems take tracing.
• Parts and repairs needed once the cause is known.
• Scheduling, such as after-hours visits for businesses.

Book an on-site visit and we will explain what the diagnosis involves before we begin.

Troubleshooting mistakes that make things worse

• Replacing the most expensive component first, before testing the cheap ones.
• Removing the ground pin from a power cord to kill a hum.
• Turning the amplifier gain all the way up to make up for a weak source.
• Factory-resetting every device at once, which erases the settings that might have pointed to the cause.
• Adding Wi-Fi extenders at random, which can create new network problems.
• Leaving a wireless subwoofer or amplifier boxed in with no airflow.

A few habits prevent many failures: surge protection on audio equipment, ventilation around amplifiers, labeled wiring, current firmware, sealed outdoor connections, and a note of what changed whenever the network or TV is replaced.

Related services

Frequently asked questions